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为确定变腹板高度组合梁的受力性能和变形特点,本文利用有限元软件ANSYS对简支组合梁在均布荷载作用下的受力特征进行了详细的分析,得到了不同跨度时组合梁的应力分布云图,将变腹板高度组合梁的刚度和承载力与等截面组合梁进行对比,确定了刚度和承载力的简化计算公式。计算结果表明:变腹板高度组合梁中钢梁的塑性区较长,几乎达到跨度的2/3,当楔率在0.4~0.6范围内时组合梁的承载能力较大;变腹板高度组合梁的荷载-挠度曲线处于腹板最大高度和腹板最小高度等截面组合梁之间,与腹板最大高度组合梁更加接近;与相同用钢量的等截面组合梁相比,变腹板高度组合梁的刚度和承载力均有显著提高。
In order to determine the mechanical properties and deformation characteristics of the composite girder with variable webs, the finite element software ANSYS is used to analyze the force characteristics of the simply supported composite girder under uniformly distributed loads. The stress By comparing the stiffness and bearing capacity of the composite girder with variable webs with the composite girder with the same cross section, a simplified calculation formula of the stiffness and bearing capacity is determined. The calculation results show that the plastic zone of the steel beam in the composite girder with variable web height is longer, almost 2/3 of the span, and the bearing capacity of the composite girder is larger when the wedge ratio is in the range of 0.4-0.6. The load-deflection curve is located between the composite girder with the maximum web height and the minimum web height, which is closer to the girder with the maximum girder height. Compared with the equivalent girder with the same cross-section, the girder height- The stiffness and bearing capacity are significantly improved.